roll: third_party/pigweed a5a1995..f848024 (2 commits)

f848024:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/237332 pw_build: Move constraint/cortex-m to constraints/cortex_m
34ca6b7:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/237152 pw_bluetooth_sapphire: Upload bt-hci-virtual CIPD

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: a5a199593f1375..f8480246f4c8a5
Roller-URL: https://ci.chromium.org/b/8735987324546950321
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I2d53e047035f7e0c5bd8e17623374c97f41a98e0
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/237374
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index a5a1995..f848024 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit a5a199593f1375177d5805f882f303d4c8b8cea2
+Subproject commit f8480246f4c8a5dd485ed19498bcd15b1d3cc3e0